package 笔试.贝壳;

import javax.swing.tree.TreeNode;
import java.util.Scanner;

public class Demo4 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);


    }

    public int maxSubTree (TreeNode root) {
        // write code here
        int res = 0;



        return 4;
    }
}
